* {
    margin: 0;
    padding: 0;
    border: 0;
}
.floatleft{
    float: left;
}
.floatright{
    float: right;
}
/*底部css代码*/
.footblock {
    height: 100px;
}

.foothr {
    clear: both;
    border: 2px solid red;
}

.content {
    width: 1000px;
    margin: auto;
}

/*顶部css代码*/
.topblock {
    height: 800px;
    background-image: url("../img/banner_qtah.jpg");
}
.topcontent{
    height: 140px;
}
.logoimg{
    height: 140px;
}

.phone{
    margin-top: 50px;
    color: white;
    font-size: 20px;
}
.nav{
    height: 100px;
    background-color: orange;
}
.navul{
list-style: none;
}
.navul li{
    float: left;
    padding: 0 10px;
    line-height: 100px;
}
.navul li:hover{
    background-color: yellow;
}
.companyad{
    height: 500px;
    font-size: 40px;
    color: white;
}
.companyad div:first-child{
    line-height: 100px;
}
.companyad p{
    font-size: 14px;
    line-height: 40px;
}
.companyad span:nth-child(odd){
    color: white;
    font-size: 20px;
}
.companyad span:nth-child(even){
    color: orange;
    font-size: 30px;
}
.companyad div:last-child{
    text-indent: 2em;
    color: orange;
    font-size: 30px;
    line-height: 50px;
}
